car has a 347 short block in it...can start car and let it idle perfect for 30 to 45 minutes...but driving after about 5 minutes car just shuts off...and wont start for about 30 to 60 minutes...but does turn over...and when it does start again...it only drive for five minutes again then shuts down....any suggestion of the problems would be helpfull.....thanks

Is it the stock fuel injection and ignition, or something aftermarket? At the five minute mark you are losing either fuel or spark, and you have to determine which one is failing.

I would suspect an intermittent fuel pump problem, either due to heat or flow restrictions. The pump has to flow a lot more when driving than it does at idle. Is the tank properly vented? It could also be an ignition module going bad, but I don't know much about what is used in a 90 Mustang.

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